Document 996E0gpRREZpDQoO2O66qnwXL

670 OCCUPATIONAL. TUMORS AND ALLIED DISEASES RADIOACTIVE ELEMENTS I. Uranium-Radium Series Name of Element Half-Time Value Type of Rays Uranium I Uranium Xi Uranium Xs, Uranium II Uranium Y Ionium Radium Radon (Radium-emanation) Radium A Radium B Radium C Radium Cj Radium Cj Radium D Radium E Radium F (Polonium) Radium G (Radium-lead) (ordinary lead) 4.67X10* Years 24.6 Days 1.15 Minutes 2X10* Years 25 Hours 6.9X104 Years 1690 Years 3-85 3 26.8 Days Minutes Minutes I9-S Minutes IO-8 Seconds 1.32 Minutes l6 Years 5 Days 136 Days alpha beta-gamma beta-gamma alpha beta alpha alpha-beta alpha alpha beta-gamma beta-gamma (alpha?) alpha beta beta-gamma beta-gamma alpha "" Atomic Weight 238.2 234 ^34 234 ' 230 225.97 222 218 214 214 214 210 210 210 206 207.2 II. Actinium Series Name of Element Half-Time Value Type of Rays Atomic Weight Uranium Y Proactinium Actinium Radioactinium Actinium X Actinon (Actinium-emanation) Actinium A Actinium B Actinium C Actinium Ci Actinium Cj Actinium D (Actinium-lead) I.O4 1.2X104 20 I9-S 11.4 3-92 . 0.002 36.1 2.15 0.005 4-76 -- Days Years Years Days days Seconds Seconds Minutes Minutes Seconds Minutes beta alpha (beta) alpha-beta gamma alpha alpha alpha beta-gamma alpha-(beta) alpha beta-gamma -- approximately 230 " 226 226 222 218 214 210 210 210 206 206 III. Thorium Series Name of Element Half-Time Value Type of Rays Thorium Mesothorium I Mesothorium II Radiothorium Thorium X Thoron (Thorium-emanation) Thorium A Thorium B Thorium C Thorium Q Thorium C2 Thorium D (Thorium-lead) 1.31X1010 Years 6.7 Years 6.2 Hours 1-9 Years 3-64 Days 54-5 Seconds 0.14 Seconds 10.6 Hours 60.8 . Minutes IO-11 Seconds 3-i Minutes alpha (beta) beta-gamma alpha-beta alpha alpha alpha beta-gamma alpha-gamma alpha beta-gamma -- Atomic Weight 232.15 228 228 228 224 220 216 212 212 212 208 208